西安电子科技大学学报（自然科学版）2025，Vol.52Issue(5)：111-120,10.DOI:10.19665/j.issn1001-2400.20250901
利用数字线性相位比对实现宽频率测量新方法
New method for wide-range frequency measurement using digital linear phase comparison
摘要
Abstract
Aiming at the current problems that although the direct counting frequency measurement has a wide measurement range,its resolution is limited,and although the indirect phase measurement has a high resolution,it has measurement dead zones and a narrow measurement range.This paper proposes a digital linear phase comparison method with a variable least common multiple period for frequency and frequency stability measurement.This method employs an analog to digital converter as a phase detector to acquire phase information,and the digital measurement approach avoids the measurement dead zone existing in traditional phase comparison methods.By controlling the phase detection region to be within the linear range,the measurement ambiguity zone is circumvented,and the measurement resolution is improved.By analyzing the variation law of phase difference between signals with arbitrary frequencies,taking the nominal least common multiple period as the sampling interval,and combining rough frequency measurement with truncation processing,the measurement range is expanded,and the noise introduced during the normalization process is avoided.Data processing is performed on the phase information in the linear region obtained by sampling,thereby completing the direct phase comparison between signals of arbitrary frequencies and achieving high-resolution measurement of frequency and frequency stability.Experimental results show that the system noise floor is better than 1.86E-15/1000s,and that under the measurement gate of 1 second,the resolution of frequency measurement can reach 20μHz.When performing the high-resolution frequency and frequency stability measurement on frequency source signals in the range of 1MHz-100MHz,the accuracy of the measurement results remains stable.关键词
频率测量/相位比对/模数转换器/频率稳定度/线性区Key words
frequency measurement/phase comparison/analog to digital converter/frequency stability/linear region分类
信息技术与安全科学引用本文复制引用
李智奇,郭义,陈晓龙,朱佳豪..利用数字线性相位比对实现宽频率测量新方法[J].西安电子科技大学学报（自然科学版）,2025,52(5):111-120,10.基金项目
重点研发计划(2023YFF0718204) （2023YFF0718204）
陕西省自然科学基金(2019JM-480) （2019JM-480）
